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In Pentriode mode, V1 essentially operates as a triode, but its screen grid current no longer burdens the plate of V1. Instead, CF V2 provides all current to V1’s screen grid. Pentriode mode brings nice advantages.

Pentriode mode is not strictly triode mode nor is it pentode mode. It is also not “ultra-linear” (aka partial-triode) operation. I had to come up with an entirely new name for this circuit, and the name Pentriode seemed appropriate. Pentriode mode is definitely most like a triode mode, with the same (or closely the same) mu and gain as the pentode would have in conventional triode connection. In fact, designing a Pentriode stage is as simple as designing a standard triode stage, the only extra part being the addition of a simple cathode follower. [...] (leggi tutto)